WO2017110020A1

WO2017110020A1 - Combustion device

Info

Publication number: WO2017110020A1
Application number: PCT/JP2016/004449
Authority: WO
Inventors: 貴大小野
Original assignee: リンナイ株式会社
Priority date: 2015-12-25
Filing date: 2016-10-03
Publication date: 2017-06-29
Also published as: US10746397B1; CN108369006B; JP2017116203A; CN108369006A; US20200271315A1; JP6542659B2; KR20180097728A; KR102514191B1

Abstract

[Problem] To provide a combustion device provided with a burner 1, a combustion housing 2 which is provided to the lower side of the burner, and which has an integrated heat exchanger, and a water jacket which is provided to the combustion housing, and which is connected to the downstream side of the heat exchanger, wherein: the water jacket is formed such that an inflow jacket part 6in provided to a side plate 24 of the combustion housing at one side in the transverse direction, and an outflow jacket part 6out provided with a tap hole 61 are connected via jacket parts provided to one side plate of the combustion housing in the front-rear direction, the side plate at the other side in the transverse direction, and the other side plate in the front-rear direction; an extended jacket part 6₄ is provided which extends in the front-rear direction from an upper part of the outflow jacket part towards the inflow jacket part; and the accumulation of air bubbles in the extended jacket part can be inhibited. [Solution] The extended jacket part 6₄ is formed such that the cross-sectional centre O1 of a tip portion thereof is positioned below the cross-sectional centre O2 of the tap hole 61.

Description

Combustion equipment

The present invention comprises a burner that ejects an air-fuel mixture downward, and a combustion housing provided on the lower side of the burner that surrounds the combustion space of the air-fuel mixture ejected from the burner, and a heat exchanger is provided in the lower portion of the combustion housing It is related with the arranged combustion device.

Conventionally, as a combustion apparatus of this type, according to Patent Document 1, in order to improve the heat resistance of the combustion casing, a water jacket is provided as a cooling means for cooling the combustion casing in the portion of the combustion casing between the burner and the heat exchanger. What is provided is known. The water jacket includes a first jacket portion extending in the lateral direction provided on one side plate on the front and rear sides of the combustion housing, a third jacket portion extending in the lateral direction provided on the other side plate on the front and rear sides of the combustion housing, A second jacket portion extending in the front-rear direction connecting the first jacket portion and the third jacket portion provided on the side plate on one side in the lateral direction, and a portion closer to the front and rear sides of the side plate on the other side in the lateral direction of the combustion housing An inflow side jacket portion that guides the water that has passed through the heat exchanger to the first jacket portion, and a third jacket portion that is provided on the other side of the side plate on the other side in the lateral direction of the combustion housing. The outflow side jacket part into which water flows in is comprised, and the upper outlet is provided in the outflow side jacket part.
And the water which passed the heat exchanger flows into the outflow side jacket part through the 1st jacket part, the 2nd jacket part, and the 3rd jacket part from the inflow side jacket part, and goes to the hot water supply path connected to this from the tap Water (hot water) is supplied. Moreover, in this, the 4th jacket part extended in the front and back one side toward the inflow side jacket part from the upper part of the outflow side jacket part is provided, and the inflow side jacket part and the outflow side jacket part of the side plate on the other side in the lateral direction of the combustion housing The part between the two can be cooled by the fourth jacket portion.

By the way, local heat (boiling) may occur in a part of the endothermic tube of the heat exchanger, and bubbles may be generated in the endothermic tube. These bubbles flow on the water stream to the outflow side jacket. Here, conventionally, the fourth jacket portion extends horizontally from the upper portion of the outflow side jacket portion to the front and rear sides. And the cross-sectional center of the front-end | tip part near the inflow jacket part of a 4th jacket part is located in the height equivalent to the cross-sectional center of a tap. Therefore, if air bubbles flow into the fourth jacket portion without flowing out from the outflow side jacket portion to the outlet, the air bubbles easily accumulate in the fourth jacket portion. And since the part which the bubble of the 4th jacket part accumulated cannot be cooled with water, temperature rises, a scale accumulates easily and durability will deteriorate.

European Patent Application Publication No. 2811141

In view of the above points, an object of the present invention is to provide a combustion apparatus capable of suppressing the accumulation of bubbles in the fourth jacket portion.

In order to solve the above-mentioned problems, the present invention comprises a burner that ejects an air-fuel mixture downward, and a combustion housing that is provided below the burner and surrounds a combustion space of the air-fuel mixture ejected from the burner. A combustion apparatus in which a heat exchanger is disposed in a lower part of the inside, and a water jacket is provided as a cooling means for cooling the combustion casing at a portion of the combustion casing between the burner and the heat exchanger. A laterally extending first jacket portion provided on one side plate of the combustion housing, a laterally extending third jacket portion provided on the other side plate of the combustion housing, and a lateral side of the combustion housing Provided on the side plate of the second jacket portion extending in the front-rear direction for connecting the first jacket portion and the third jacket portion, and provided on a portion closer to the front and rear of the side plate on the other side in the lateral direction of the combustion housing, Passed the heat exchanger An inflow side jacket portion that guides water to the first jacket portion, and an outflow side jacket portion into which water from the third jacket portion flows in a portion near the other side of the side plate on the other side in the lateral direction of the combustion housing In addition, the outflow side jacket portion is provided with an upper outlet, and the fourth jacket portion extending from the upper portion of the outflow side jacket portion to the vicinity of the inflow side jacket portion is provided in the front and rear sides. The jacket part is formed so that the cross-sectional center of the tip part near the inflow side jacket part is positioned below the cross-sectional center of the tap.

According to the present invention, a natural convection in the fourth jacket portion is promoted by providing a height difference between the tap and the tip of the fourth jacket portion. For this reason, even if bubbles due to local heat flow into the fourth jacket portion, the bubbles are carried to the hot water outlet by a flow due to natural convection, and the bubbles can be prevented from accumulating in the fourth jacket portion. Therefore, it is possible to prevent the durability from deteriorating due to the accumulation of scale due to the temperature rise caused by the accumulation of bubbles.

In the present invention, the upper surface of the fourth jacket portion is formed as an inclined surface that is inclined upward from the tip portion near the inflow side jacket portion toward the upper surface of the outlet side of the outflow side jacket portion. It is desirable. According to this, it becomes easy to flow a bubble toward the hot water outlet side along the upper surface of the 4th jacket part, and it can prevent more effectively that a bubble accumulates in the 4th jacket part.

The perspective view of the combustion apparatus of embodiment of this invention. The perspective view of the combustion apparatus of embodiment seen from the opposite side to FIG. Sectional drawing cut | disconnected by the III-III line of FIG. Sectional drawing cut | disconnected by the IV-IV line | wire of FIG. The side view seen from the transverse direction other side of the combustion device of an embodiment. Sectional drawing cut | disconnected by the VI-VI line of FIG.

1 to 4, a combustion apparatus according to an embodiment of the present invention includes a burner body 11 to which an air-fuel mixture (a mixed gas of fuel gas and primary air) is supplied, and a burner body 11 facing downward. A combustion plate 12 made of sheet metal that covers the open surface 111, and a burner 1 in which an air-fuel mixture is ejected downward from an air-fuel mixture ejection part 121 provided on the combustion plate 12, and a combustion space of the air-fuel mixture ejected from the burner 1 A surrounding combustion housing 2 is provided. A heat exchanger 3 for hot water supply is housed in the lower part of the combustion housing 2. In addition, the upper end portion of the combustion housing 2 is provided with a joining flange portion 22 that is fastened with a screw 21 to a body flange portion 112 that surrounds the open surface 111 of the burner body 11. A combustion plate flange portion 122 at the periphery of the combustion plate 12 is sandwiched between the joint flange portion 22 and the body flange portion 112.

The burner body 11 is provided with an inlet 113 for connecting the fan 4 that supplies the air-fuel mixture. The inflow port 113 is equipped with a check valve 13 that prevents the air-fuel mixture remaining in the burner body 11 from flowing backward to the fan 4 side when the fan 4 is stopped. The check valve 13 includes a resin valve casing 131 fitted into the inflow port 113 and a resin valve plate 132 pivotally attached to an opening of the valve casing 131 facing the inside of the burner body 11 so as to be opened and closed. ing. The combustion plate 12 has a large opening at the center. A heat-resistant fiber woven fabric 121a is attached to the opening, and a distribution plate 121b on which a number of distribution holes are formed is overlaid, and the woven fabric 121a and the distribution plate 121b constitute an air-fuel mixture ejection portion 121. Yes. Then, the air-fuel mixture supplied from the fan 4 into the burner body 11 is ejected from the air-fuel mixture ejection part 121 so that all primary combustion occurs. It is also possible to form a large number of flame holes in a combustion plate that does not have a large opening, and to form an air-fuel mixture ejection part with these flame holes.

The heat exchanger 3 is configured by a fin tube type heat exchanger including a large number of fins 31 and a plurality of heat absorption tubes 32 penetrating the fins 31. On the outer surface of the

side plates

23 and 24 on the one side in the horizontal direction and the other side of the combustion housing 2, a connection lid 33 that defines a connection path between two adjacent

heat absorption tubes

32 and 32 between the

side plates

23 and 24. Are installed. And all the heat absorption pipe | tubes 32 are connected in series by these connection paths. Further, a water inlet 34 is provided in a connection lid 33 that defines a connection path connected to the heat absorption pipe 32 at the upstream end between the side plate 23 on one side in the horizontal direction.

An electrode component 5 having an ignition electrode 51, a ground electrode 52, and a frame rod 53 that passes through the front plate 26 of the combustion housing 2 and protrudes into the combustion housing 2 is mounted on the side plate 26. The electrode part 5 is provided with a viewing window 54 through which the inside of the combustion housing 2 can be visually confirmed.

Further, a water jacket 6 is provided as a cooling means for cooling the combustion casing 2 at a portion between the burner 1 of the combustion casing 2 and the heat exchanger 3. The water jacket 6, before and after one side plate of the combustion housing 2, for example, a first jacket portion 6 ₁ of the upper and lower three consisting of water tubes extending in the lateral direction provided in the rear side plate 25, front and rear combustion housing 2 other side plates, for example, a third jacket portion 6 ₃ of the upper and lower three consisting of water tubes extending in the lateral direction provided in the front side plate 26, provided laterally one side of the side plate 23 of the combustion housing 2, the upper and lower 3 this first jacket portion ₆₁ and the upper and lower three third jacket portion 6 ₃ of the upper and lower three second jacket portion 6 ₂ extending in the longitudinal direction connected as illustrated in FIG. 6, the horizontal direction other combustion housing 2 provided rearward portion of the side of the side plate 24, a longitudinal inlet side jacket portion 6in vertically guided to the first jacket portion ₆₁ of the water passing through the heat exchanger 3 up and down three, combustion housing 2 Set on the front side of the side plate 24 on the other side of the Was, the water from the upper and lower three third jacket portion 6 ₃ is composed of an outflow-side jacket portion 6out the longitudinal vertically flowing. At the upper part of the outflow side jacket portion 6out, there is provided a hot water outlet 61 that opens in the lateral direction to connect the hot water supply passage. Thus, the water passing through the heat exchanger 3 (hot water) is the outflow side jacket portion from the inlet side jacket portion 6in via the first jacket portion ₆₁ and the second jacket portion 6 ₂ and the third jacket portion 6 ₃ It flows to 6out and is supplied from the hot water outlet 61 to the hot water supply passage.

The second jacket portion 6 ₂ is constituted by a recess 6 _{2 a} cover plate 6 _{2 b} which recess covering 6 _{2 a} of Toko in the lateral inward formed laterally one side of the side plate 23 of the combustion housing 2 Is done. Also, the jacket portions 6in and 6out on the inflow side and the outflow side also have inward recesses 6ina and 6outa formed in the side plate 24 on the other side in the lateral direction of the combustion housing 2 and a cover plate covering the recesses 6ina and 6outa. 6inb and 6outb.

Here, the side plate 23 and the front side plate 26 of the rear side plate 25 and the lateral one side combustion housing 2 flows respectively first jacket portion ₆₁ and the second jacket portion 6 ₂ and the third jacket portion 6 ₃ water It is cooled by. Further, in the transverse direction the other side of the side plate 24 of the combustion housing 2, fourth jacket portion 6 ₄ is provided extending rearward toward the upper portion of the outflow-side jacket portion 6out in the vicinity of the inlet-side jacket portion 6in. According to this, both the jacket portion 6in the inflow side and the outflow side of the lateral other side of the side plate 24 of the combustion plate 2, portions between 6out is cooled by water in the fourth the jacket portion 6 _4. The fourth jacket portion _{6 4} is constituted by a cover plate _{6 4} b for covering the recess _{6 4} a recess _{6 4} a of Toko in the lateral direction inwardly formed in the side plate 24. Then, _{6 4} a and the cover plate _{6 4} b depression of the fourth jacket portion _{6 4} is continuous with recess 6outa and the cover plate 6outb the outflow-side jacket portion 6out.

Meanwhile, when the fourth jacket portion 6 ₄ extends horizontally rearward from the upper portion of the outflow-side jacket portion 6out, when air bubbles generated in the local heat has flowed from the outlet side jacket portion 6out the fourth jacket portion 6 _4, the 4 become jacket section 6 ₄ easy bubbles accumulate. A portion of the bubble of the fourth jacket portion 6 ₄ is accumulated because not be cooled with water, elevated temperature, scale tends to accumulate, the durability is deteriorated.

Therefore, in this embodiment, the so manifest as in FIG. 5, the cross-sectional center O1 of the fourth distal end of the inflow-side jacket portion 6in side of the jacket portion 6 ₄ is located below the cross-sectional center O2 of the tap hole 61 4 to form a jacket portion _{6 4.} According to this, the height difference is given to between the outflow position 61 distal portion of the fourth jacket portion 6 _4, natural convection in the fourth inner jacket portion 6 ₄ is promoted. Therefore, even if air bubbles by the local heat to the fourth jacket portion 6 ₄ flows, the bubbles are carried to the tap hole 61 in the flow due to natural convection, it is possible to suppress the air bubbles accumulated in the fourth jacket portion 6 _4. Accordingly, in the fourth jacket portion 6 temperature rise of ₄ due to the air bubbles are accumulated, the scale can be prevented durability accumulate deteriorates.

Further, in the present embodiment, the upper surface of the _fourth jacket portion 64 is inclined upwardly from the tip portion near the inflow side jacket portion 6in toward the upper surface of the portion where the outlet 61 of the outflow side jacket portion 6out is provided. Formed on the surface. Therefore, bubbles are likely to flow to the tap hole 61 side along the upper surface of the fourth jacket portion 6 _4, can be more effectively prevented that the air bubbles collected in the fourth jacket portion 6 _4.

As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to this. For example, in the above-described embodiment, the heat exchanger 3 for hot water supply is stored in the combustion housing 2, but a heat exchanger for uses other than hot water supply for heating or the like may be stored in the combustion housing 2.

DESCRIPTION OF SYMBOLS 1 ... Burner, 2 ... Combustion housing, 23 ... Side plate on one side in the lateral direction, 24 ... Side plate on the other side in the lateral direction, 25 ... Side plate on the rear side (front and rear), 26 ... Side plate on the front side (front and rear) Exchanger, 6 ... water jacket, 6in ... inlet side jacket part, 6out ... outlet side jacket part, 6 ₁ ... first jacket part, 6 ₂ ... second jacket part, 6 ₃ ... third jacket part, 6 ₄ ... first 4 jacket portions, 61... Tap, O1... Center of the cross section of the tip of the fourth jacket portion, O2.

Claims

Combustion with a burner that ejects the air-fuel mixture downwards, and a combustion housing provided on the lower side of the burner that surrounds the combustion space of the air-fuel mixture ejected from the burner, and a heat exchanger is arranged in the lower part of the combustion housing In the apparatus, a water jacket is provided as a cooling means for cooling the combustion casing at a portion of the combustion casing between the burner and the heat exchanger, and the water jacket is provided on one of the front and rear side plates of the combustion casing. A first jacket portion extending in the lateral direction; a third jacket portion extending in the lateral direction provided on the other side plate of the combustion housing; and a first jacket portion provided on the side plate on one side of the combustion housing in the lateral direction; The second jacket part extending in the front-rear direction connecting the third jacket part, and the first jacket part is provided with water that has passed through the heat exchanger provided in a part closer to the front and rear of the side plate on the other side in the lateral direction of the combustion housing. Inflow side jacket leading to And an outflow side jacket portion into which water from the third jacket portion flows, provided on the other side of the side plate on the other side in the lateral direction of the combustion housing. And a fourth jacket part extending from the upper part of the outflow side jacket part to the vicinity of the inflow side jacket part in the front and rear side,
The fourth jacket part is formed so that the cross-sectional center of the tip part near the inflow side jacket part is positioned below the cross-sectional center of the tap.
The upper surface of the fourth jacket portion is formed as an inclined surface that is inclined upward from the tip portion toward the upper surface of a portion of the outflow side jacket portion where the outlet is provided. Combustion equipment.